the prototype is tested now and it works fine. you could mount it piggyback style on your TH LPG 292c PCB, even the mode switch pads are in the correct position, so one could use long pins instead of headers/cables to connect the boards.
however, i brought the actual switch terminals of the IC to pads, so this board could be used as gate controlled 3-pol on-off-on switch for other projects (signals from -7V to + 7V).
switching audio can always be a problem, i believe. so it is here: you might experience little pops when switching audio, depending on the signals you are switching. you will have experienced this with professional modules, too.

EDIT 22 SEP 09:
i will write up some building docs soon, boards should be available beginning of october.

EDIT 23 SEP 09:
the manufacturer scheduled the delivery of the boards on 7th of october. unfortunately i will then have to go on a business travel to the states, followed by a short vacation.
so i fear i will not be able to send out the boards before monday, 26th of october.
i am so sorry for that delay, however i hope you'll understand.

all PCBs are spoken for
however, you can still contact me if you are interested in the boards. i will have a waiting list, and i could re-order some boards from the PCB house.

the mode is controlled by gates, not by triggers. trigger control would need a lot more of logic and you would need to send a trigger for i.e. "lopass on" and another for "lopass off". complicated.
it is controlled by gates, just as the doepfer A-101-2, and i would not have thought this to be 'completely useless', because he sells the A-101-2 this way since 2004 at least. maybe i am wrong.

anyways, controlled by a devider one would have to select the next greater division, due to the 50% duty cycle of most dividers. controlled by a sequencer the dedicated gate bus would have to work in "merged"-mode. however, this all depends on what you wanted to do...

the circuitry works like one 3-pole on-off-on switch, all three poles are needed for the LPG modes.
for each gate input there is a switch to control the gates state manually. each gates state gets indicated by a LED also. i think it will become clearer as soon as i built the module._________________
cheers,
matthias
____________
fonitronik at
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i have analog switches that need to be hold in my 100M and did have also in the 700 and never use them because they are very difficult to control if u want to switch someting fast in sync.

controlling by an lfo for example u can never get fast switching in sync.

with a trigger pulse to change the state is much more interesting,why?

because u can use simple triggers to on/off a modulation source,it can repplaces a vca in some sort,now u NEED to sacrifice an modulation source to control the switch that in turn will anable/disable another modulation source so thats completely useless.

u can also use it easy to transpose a sequence just by merging +v with the seq voltage out by triggering the switch easly on/of via your gate/trigger bus of your sequencer,but if the switch need a sustained gate this application sucks..

so for the LPG it could be an ok add-on but as an externall module i have doubth anyone will use it very offen.

if u made it with trigger i buy you 20 pcb's or maybe custom order with 4 or 8 switches on one pcb then i buy 10

if u made it with trigger i buy you 20 pcb's or maybe custom order with 4 or 8 switches on one pcb then i buy 10

so what about triggerable 1-pole on-on switches? my seq switch is actually exactly that, when set to 2 steps length. with 3 steps length it would work as on-off-on (no signal applied to step 2) for multiple poles one would have to put them in parallel, one SeqSwitch for each pole.
so actually you are asking for a board with multiple SeqSwitches?_________________
cheers,
matthias
____________
fonitronik at
FlickR (pix) / SoundCloud (sounds) / YouTube (vids) / Vimeo (vids) / facebook (news)

if u made it with trigger i buy you 20 pcb's or maybe custom order with 4 or 8 switches on one pcb then i buy 10

so what about triggerable 1-pole on-on switches? my seq switch is actually exactly that, when set to 2 steps length. with 3 steps length it would work as on-off-on (no signal applied to step 2) for multiple poles one would have to put them in parallel, one SeqSwitch for each pole.
so actually you are asking for a board with multiple SeqSwitches?

yes on-off,on-on is fine but did u see how big and how much components the pcb's are just to have 1 single switch function then,not to talk abouth the costs of the components (expensive DG ic)

i need something to be able to crop behind a small frontpanel 22x4cm and frontpanels space must be full used,so i guess 6 switch functions could fit for sure(maybe

immagine u have a set of 3 lfo's and 3 vco's ,u feedback all in and outs between them passing thru those switches,with the lfo pulse out u also controls them,i think u get weird shit..

hey,but don't let u be influenced by what i write here he Matt,just do what U did have in mind

i did integrate in the past in a custom sequencer something just with an solid state relais,u only then need a sustained 5v gate to switch,it works great relais is not cheap but no components needed ,don't even need an pcb ,enoying is at audio speed the relais is getting audible nervous lol

4 on-off switches, toggled by triggers,
able to run on audiospeed. ( this is important ! )
( yup, should be somewhat compact if ever possible )
that is what i would need.
( i don't care if i need one switch for 0.50$ or 4 switches for 4$, it's still very cheap )

concerning the LPG:
it needs 4switches when the LPG needs 3.
Why ?
Lets' say it like this: asssoon that you switch LPG modes, the Idea might appear to switch some more in the same time.
just think to your switched filter project for example

hey,but don't let u be influenced by what i write here he Matt,just do what U did have in mind

why not getting influenced AND doing what i have in mind?
i mean you're coming up with some good ideas, and the discussion and exchange of ideas will lead to a new and perhaps useful project!? that's what a forum is for, i think._________________
cheers,
matthias
____________
fonitronik at
FlickR (pix) / SoundCloud (sounds) / YouTube (vids) / Vimeo (vids) / facebook (news)

hey,but don't let u be influenced by what i write here he Matt,just do what U did have in mind

why not getting influenced AND doing what i have in mind?
i mean you're coming up with some good ideas, and the discussion and exchange of ideas will lead to a new and perhaps useful project!? that's what a forum is for, i think.

Yes,but its not with an intension,and i also don't want its percieved like that to force you.

Its rather out of own experience (like i told ,i have switches in my vintage modular) to point out they r not so usefull or would better describe it as not so very handy to use as an separate module if u need a sustained control signal,but that could be different for somebody else ofcource.

i put the whole module together last night. it is working quite nice. a little video will follow later to demonstrate the functionality of the push buttons and gate inputs.
and arrgh... i recognized a mistake in the truthtable which is on my frontpanel now: i mixed up gate and lopass (!)

as you can see there is a pushbutton with LED and a gate input for each gate. the pushbutton overwrites the gate input.
this way one could i.e. manually set Gate A to high (using the pushbutton) and remote control gate B with a gate signal. without removing the patchcord one could manually set gate B then, overwriting the gate input. i think this much more versatile than the doepfer solution (needs more panel space, though).

so here is a short little vid demonstrating the functionality of the gates and pushbuttons. i aplogize for the bad sound quality, but u had to put the headphones onto the camcorder
hopefully i will be ablt to do a better version these days. however, you get the idea, i guess:

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